Kakuro

Language:

4x4: easy intermediate hard challenging expert
6x6: easy intermediate hard challenging expert
8x8: easy intermediate hard challenging expert
9x11: easy intermediate hard challenging expert
9x17: easy intermediate hard challenging expert

Kakuro is like a crossword puzzle with numbers. Each "word" must add up to the number provided in the clue above it or to the left. Words can only use the numbers 1 through 9, and a given number can only be used once in a word. Every kakuro puzzle has one and only solution, and can be solved through logic alone.

Kakuro Blog
Kakuro Rules
Kakuro Tutorials: Basic Challenging

Kakuro Hint: Start with clues that only have one valid combination. For example, 3 in 2 must be 1 and 2, and 23 in 3 must be 6, 8, and 9.

		30	8		18	26		4	11
	10 17			10			12 12
16				23 7
17			10 22					38	3
	28						6
	11 14					9	5 5
12				7	10				11
11					20 12
		6 23				11	16 39
	34 16
13			9	18 10				33	16
23					26
	7 11				32	23 11
15				26 15
5			16 7						9
	16	24 10					5 16
27						24
9			3			17

Free online kakuro puzzles